// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/fetchers/multi_resolution_image_resource_fetcher.h"

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "content/child/image_decoder.h"
#include "content/public/renderer/associated_resource_fetcher.h"
#include "third_party/WebKit/public/platform/WebURLResponse.h"
#include "third_party/WebKit/public/web/WebAssociatedURLLoaderOptions.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/geometry/size.h"

using blink::WebAssociatedURLLoaderOptions;
using blink::WebFrame;
using blink::WebURLRequest;
using blink::WebURLResponse;

namespace content {

MultiResolutionImageResourceFetcher::MultiResolutionImageResourceFetcher(
    const GURL& image_url,
    WebFrame* frame,
    int id,
    WebURLRequest::RequestContext request_context,
    blink::WebCachePolicy cache_policy,
    const Callback& callback)
    : callback_(callback)
    , id_(id)
    , http_status_code_(0)
    , image_url_(image_url)
{
    fetcher_.reset(AssociatedResourceFetcher::Create(image_url));

    WebAssociatedURLLoaderOptions options;
    options.allowCredentials = true;
    options.crossOriginRequestPolicy = WebAssociatedURLLoaderOptions::CrossOriginRequestPolicyAllow;
    fetcher_->SetLoaderOptions(options);

    // To prevent cache tainting, the favicon requests have to by-pass the service
    // workers. This should ideally not happen or at least not all the time.
    // See https://crbug.com/448427
    if (request_context == WebURLRequest::RequestContextFavicon)
        fetcher_->SetSkipServiceWorker(WebURLRequest::SkipServiceWorker::All);

    fetcher_->SetCachePolicy(cache_policy);

    fetcher_->Start(
        frame,
        request_context,
        WebURLRequest::FrameTypeNone,
        base::Bind(&MultiResolutionImageResourceFetcher::OnURLFetchComplete,
            base::Unretained(this)));
}

MultiResolutionImageResourceFetcher::~MultiResolutionImageResourceFetcher()
{
}

void MultiResolutionImageResourceFetcher::OnURLFetchComplete(
    const WebURLResponse& response,
    const std::string& data)
{
    std::vector<SkBitmap> bitmaps;
    if (!response.isNull()) {
        http_status_code_ = response.httpStatusCode();
        GURL url(response.url());
        if (http_status_code_ == 200 || url.SchemeIsFile()) {
            // Request succeeded, try to convert it to an image.
            bitmaps = ImageDecoder::DecodeAll(
                reinterpret_cast<const unsigned char*>(data.data()), data.size());
        }
    } // else case:
    // If we get here, it means no image from server or couldn't decode the
    // response as an image. The delegate will see an empty vector.

    // Take a reference to the callback as running the callback may lead to our
    // destruction.
    Callback callback = callback_;
    callback.Run(this, bitmaps);
}

void MultiResolutionImageResourceFetcher::OnRenderFrameDestruct()
{
    // Take a reference to the callback as running the callback may lead to our
    // destruction.
    Callback callback = callback_;
    callback.Run(this, std::vector<SkBitmap>());
}

} // namespace content
